COV has a lot of great things going for it and is probably the most original MMO out there, but there's nothing to it aside from combat, which can get boring.
That latter point describes every other MMO in the known universe, so, GOOD LUCK!
Check out the MMO holy wars thread I made. There are lots of MMO reviews in there.
http://www.i-mockery.net/viewtopic.php?t=20985